Mongoose provides both threat (+crit) and mitigation(+armor, +SD) in the same enchant. +110 AP is just going to provide you a limited amount of threat. The Mongoose uptime is significant enough to make it a much better enchant.
If you are using the same weapon in your kitty duties, you've got to either prioritize cat dps or bearness. Massacre is going to be the better kitty enchant.